@TahirKh92362300 @itosettiMD_MBA @CDCgov The first sentence is not always true. It depends on a variety of factors including crowding and ventilation. Someone breathing right in your face from half an arms length away on an airplane is not addressed by the air being filtered minutes later.
@TahirKh92362300@itosettiMD_MBA@CDCgov第一句话并不总是正确的。这取决于各种因素，包括拥挤和通风。在飞机上，有人从半个手臂的距离直接对着你的脸呼吸，但几分钟后被过滤的空气并不能解决这个问题。